<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        /* !important>id>class 元素选择器 */
    p{color:red;}
    .one{color:blue;}
    #two{color:green;}
    </style>
</head>
<body>
    <p class="one" id="two">hello </p>
</body>
</html>
